Figure 3
Key:
1 water pressure switch
automatic bypass
3 gas valve
4 ignition electrode
5 central heating NTC sensor
6 overheat safety thermostat
7 flue-water exchanger
8 flue hood
9 flue thermostat
instructions pertaininG to the
1.240 i
heating
gas
inlet
10 flame detector electrode
11 main burner
1 burner injectors
13 expansion vessel
14 automatic air vent
15 pump and air separator
16 boiler drain point
17 manometer
18 pressure relief valve
instaLLer
5
domestic
heating
water inlet
return
94.674. - GB